DM74ALS257M

Overview

The DM74ALS257M is a quad multiplexer from the Advanced Low-power Schottky (ALS) logic family, manufactured by Fairchild Semiconductor. It integrates four independent 2-line to 1-line data selectors within a single 16-pin SOIC package. The device operates on a single power supply ranging from 4.5V to 5.5V and supports surface-mount installation. It features true outputs and is designed for commercial temperature environments spanning 0°C to +70°C.

Feature Summary

• Integrates four independent 2-to-1 multiplexing circuits in a compact surface-mount package
• Utilizes Advanced Low-power Schottky technology for optimized switching performance
• Provides true output signals with three-state capability for bus isolation

Applications

• Data selection in microprocessor systems
• Memory address decoding applications
• Asynchronous bidirectional data bus routing

Procurement Notes

Verify component authenticity through authorized distributors or certified secondary market suppliers. Confirm manufacturing date codes and lot traceability to ensure compliance with original Fairchild specifications. Inspect packaging integrity to prevent moisture damage during storage and handling prior to reflow soldering processes.

Selection Notes

Evaluate propagation delay requirements against the ALS series specifications to ensure timing compatibility. Verify voltage levels match the 4.5V to 5.5V operating range. Consider the 16-SOIC footprint constraints and thermal dissipation characteristics relative to the application environment and board layout limitations.

Part Context

This component belongs to the DM74ALS series of logic integrated circuits, representing an evolution in low-power Schottky technology. It serves as a specialized signal routing element within digital logic families, providing high-speed data selection capabilities while maintaining lower power consumption compared to standard TTL counterparts.

Replacement Considerations

SN74ALS257D is documented as a parameter-equivalent substitute.